A019079 - OEIS

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A019079 as a simple table

n	a(n)
3	0
4	1
5	3
6	6
7	13
8	21
9	51
10	135
11	249
12	543
13	1328
14	2956
15	7043
16	17203
17	41428
18	107072
19	267949
20	690239
21	1798709
22	4699760
23	12295826
24	32482487
25	85555718
26	226123395
27	597986158
28	1582730101
29	4190781497
30	11106106487

[0,1,3,6,13,21,51,135,249,543,1328,2956,7043, 17203,41428,107072,267949,690239,1798709,4699760, 12295826,32482487,85555718,226123395,597986158, 1582730101,4190781497,11106106487]